I can exclusively reveal that I am, in fact, currently in the pre-production stage of an MMO. It is called Star Vapor. In addition to the game, I hope to develop the multi-property potential of this exciting new IP, starting with a spin-off line of merchandise called Star Vapor Wares.
Seriously though... I have no current plans for any sequels. Or MMOs.
Don't worry about it. The sales trickle is sufficient to pay for the site; and even if it wasn't, I'd keep the site up anyway.
Cheers!